Update documentation about default Renderers, based on code.
Update documentation about default Renderers, based on code.

In the documentation, it was previously copied, and not in sync.  Using a literalinclude
will make sure the doc is in sync with the code.

pombreda/formalchemy,pombreda/formalchemy,pombreda/formalchemy,Alwnikrotikz/formalchemy,pombreda/formalchemy,Alwnikrotikz/formalchemy,Alwnikrotikz/formalchemy,Alwnikrotikz/formalchemy